Printing-press



II/I. A. DHOITCOUR.

PRINTING PRESS.

APPLICATIGN FILED DEC. l2, 1917.

Patented J une 7 1921.

Z SHEETS-SHEET I.

Hmmm@ F, UNHIMV hnlnrslxlxnlh u u n non nh. uhhh Pun n M. A. DROITCOUR] PRlNTING PRESS.

APPucATloN FILVED Dec. 12. 1917.

Patented June 7, 1921.

2 SHEETSSHEET 2.

IN VENTR UNITED sreiesv Miei-inni. a. nitoifrooua, or prunes, onio.

i Specification of Letters Patent.

Patented J une 7., 1,921.

' Original application filed April 11, 1917, Serial No. 161,338. Divided and this application filed December 12, 1917. Serial No. 206,754. i

To all 'wwmz't may concern:

Be it known that I, yl\4ioHAiii. A. Dnoi'iooUii, a citizen of the United States, and a resident of Delphes in the county of Van lert and State of himhave invented a certain new and useful Printing-Press; and l do hereby declarethe followingto `be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to'imake and use the same, reference being had to the accompanying drawings, and to the characters of reference` marked thereon, which form l a part of this specification.

This invention relates particularly to printing presses of the flat-bed and cylinder type, and is divided out of my `co-pending application, Serial No. 161,888, filed April 11, 1917. f

The primary object of my invention is the provision, in an apparatus ofthe class described, of improved mechanism forA throwing the cylinder on and off impression, and a preferred embodiment thereof isv illustrated in the accompanying. drawing, iii which, Y

Figure l isa side elevation of a press' embodying my invention, with parts `broken away. Figs. 2 and 3 are different fragmentary detailed views ofthe impression control means, ,withv parts in section; Fig. 4 is a longitudinal section with parts removed and parts broken away. Fig. 5 is an enlarged perspective view of a part of the impression control means. vFigs. 6 and 7 are enlarged detail sections of the cyl-' inder supporting devices. f

Referring vto :the drawings, lV designates the press frame, of any suitable construction, and 2 the customary bed, which is mounted for reciprocatory movements under a continuously-driven impression cylinder 3, as is well understood in the art.

The main drive shaft 4 of the press isi' mounted transversely in the frame l below the bed 2 and from the shaft reciproeateryr movement may be imparted to the bed as set forthin' my aforesaid application.

The crank-gear 24 is geared to the shaft 4to have three revolutions for each' cycle:

revolution of the crank' gear taking placey at each impression and return stroke ofthe bed and a half revolution of 4such ing place at each reverse stroke. j

rlhe journals 45`of the cylinder 3 are-carried by bearing blocks 46 (Figs. 6 and 7). which are mounted in vertical guide-ways the frame l for vertical reciprocatory movements.v The blocks 46 are yieldingly supported by coiled compression springs 47,

which normally act to supporty the cylinderin raised position with respect to the bed. Each block 46'has a short rock-shaftV 4S mounted on the top thereof, being partially seated in a depression provided therefor in the top of the block. The top side of the rock-shaft 48 is recessed longitudinally thereof to form aseat for the lower'end of an impression knuckle 49, which rests for pivotal rocking movements on said vrockshaft and has its upper end seating againstv the under side of a thrust block 50 in pivotal engagement therewith (Figs. 5,6 and 7 ).1 When the knuckle 49 is in vertical position or in radial relation to the rock-'shaft 48, the journal block 46 is lowered against the tension of the springs 47 .toeffect a lowering of the cylinder to impression position, and when the shaft 48 is rocked. slightly inone direction or the other the inner endv of the knuckle 49 is swung laterally, there- 'by shortening the distance between the shaft 48 and thrust-block 50 and permitting a raising of the cylinder from impression position. The sha-ft 48 and knuckle 49 act inthe manner of a toggle. The .thrust-block 50 is mounted in a head-piece 51 of the frame and.

projecting laterally therefrom and connectedV gear tak-l by a link 54 to a subja'cent yrocker-arm 55` on the adjacent end of a rock shaft v56, which is j ournaledin the base portion of the frame l transversely thereof (Figs. 1,12 and 3). The shaft'56 is provided at one end thereof without the frame l with a loose rocker arm 57, which is upwardly directed and carries at its free end a roller 58, which travels in a cam-groove 59 in the side of agear wheel 60 that is mounted on the outer adjacent end gether for'unitary movements in the manner l Y Y L L of a bell-cranlrlever. It isV thus evident that of the shaft 38. The gear wheel 6() is continuously driven by a pinion 61, that is fixed to the continuously driven loose gear 21, the ratio of the gears being such as to cause the gear 60 to maleone revolution to each two revolutions of the cylinder 3, which is driven v by the gear 21 through a gear 62'of the same size. vThe rocker-arm 57 has a finger 63 prov endA with a notch for receiving a stud 65 on va sideof the adjacent rocker arm 55.

The dog 6l normally lengages said stud so that therrofcker arms'155 and 57 are locked tof during anaimpression stroke of the bed the cylinder isheld in loweredy position by reason of the roller 58 traveling in the outer neutral portion ofthe cam-way 59, as shown in Figs. 1 and 3, andt'hat said roller when ytraveling in the remainingV portion of the cam-way permits the cylinder `to move to and remain in impression released position.

Anvmpression trip lever 66 (Figs. 2 and 3)-, is pivotedto the side of the frame 1, at

'wvhich the catch 6l is disposed, and has ya finger 67 pivotally .projecting upward from the-cuterl end of its freeiarm and carrying a roller 68. .'Tliislroller is yieldingly held in rolling contact with a cam surface 69 at the upper innerside edge of the catch 6l by a spring 70, and upon a depression of the outer end of the lever 66'the roller 68 is caused to travel up the cam surface 69 andapproach the peripheryoffthe cam-wheel 60, .and to' x stand in position for a cam-block 7l-on: the

peripheral portion of the wheelfGO to strike saidgrollerand communicate a trip movementv through it to the catch 6-1 to throw it Y outwardfrom Vengagement with the catch- 'i stud 65.5 This trip can only take place when theyroller 58 is in the inwardly retracted portionof the cam-way 59, as is apparent by reasonof the position-fof the parts in Figs.

v 2 and and the cam-plate 71 Vis positioned to :effect atripping of thecatch 64 shortly before the entrance of theroller 58 into the outergneutral portionof the cam-way 59. It

' is'evident that whenthe catch 6l is released from the catch lug 65 the rocker arm -57 is "permitted'to have free rocking movements relative to the shaft 56 and rocker-arm 55.

The normal inactive position of the roller 68 with the, trip lever raised is kshown in Figs. 2 and-'3, and a depression ofthe trip lever from this position with the parts in the 71 arsufiicient distance to disengage the catch l positions shown in-'Fig 2 will Vcause a suflicient movement'of the roller 68 by the cam surface 69 -to place saidroller in position to be engaged and moved outward ,by the block 6tffrom the` lug 65.

Vment with the catch lug 65,011 one of said arms 155.' The depression ofthe arms v55 75 communicates a downward rocking movement to the rocker arms 53 (Figs. 1, 6 and 7) and a consequent rocking of the shafts 48 to move the knuckles 49 t0 vertical or cylinder depressing position, as shown in Figs. 1 andl 7 .Y VAfterthe impression stroke, the roller 58i1noves to the radially restricted portion of -thefcam-way59 and'permits a raising of thecylinder Vto inoperative position. Should it ber desiredtoprevent an impression taking place at any cycle of operations, the operator depresses the foot pedal 66-from .the position shown in Fig. 2, thereby throwing theY roller68 upward into position to be engaged by the cam-plate 71 at a predetermined point in its revolution. The engagement of saidV roller by the. camplate causesan outward swinging of the catch 64 from stud engaging position, so that a rocking movement of the rocker yarm 57 will not be communicated tothe rocker arms 55.V Thecylinder will continue to miss iinpressionsso long as the foot pedal 66 remains depressed,

Having'thus described my invention, what 100 I claim as new, 'and 4desire to Vsecure by Letters Patent, is-'-` v l. ln a printing press; an'impression cylinder; a rotatable'cam; a rocker arm actuated by said cam-and having a linger; a second rocker arm below the finger: means controlled by said second rocker arm to move said cylinder on and off impression; acatch carried by the said finger and releasably engaged with said second-rocker arm to lock the arms together, said catch having a cam surface; a manually operable-levenra trip member movably carried by said lever adapted when the lever is depressed to be thereby positioned against theV camsurface of said catch; and a `cam member moving with said cam "and, adapted to directly engage saidtrip member and force it to disengage the catch from said second rocker arm when the `camrea'ches` apredetermined 120 point in its revolution; f .A

2. In a printing press, an impression cylinder; a rotatable cam; a 4rocker arm actuated by said cam'; a second rocker arm having a stud; means controlled by said second rockerarm to move said cylinder on Vand off impression; a catch pivotally hung on said Vrst rocker arm and releasably engaged with said studrto lock the rocker arms t0- gether, said catch having acamV surface an impression trip lever, a trip member pivot-V ally mounted on said 'lever and adapted to be positioned thereby against the cam surface of said catch; and a, @am member moving with said eem adapted to engage. said trip-member and canse it to force the catch out of engagement With said stud When the In testimony whereof, I havehereunto signed my name' to this speciieation.

MICHAEL A. DROITCOUR. 

